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Store YGFloatOptional in 32 bits

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Summary:
@public

After removing `-ffast-math`, `NaN` can again be used to represent `undefined`. That allows us to remove the additional flag from `YGFloatOptional`, and reduce memory usage.

Reviewed By: SidharthGuglani

Differential Revision: D13439611

fbshipit-source-id: 93e90f72f0415edb228b4e7d145e1fae35cc6b43
This commit is contained in:
David Aurelio
2018-12-13 07:09:30 -08:00
committed by Facebook Github Bot
parent da678ef971
commit 6bdd39d0ed
4 changed files with 34 additions and 63 deletions
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32
yoga/YGFloatOptional.h
View File

@@ -6,37 +6,33 @@
*/
#pragma once
#include <cmath>
#include <limits>
struct YGFloatOptional {
private:
float value_ = 0;
bool isUndefined_ = true;
float value_ = std::numeric_limits<float>::quiet_NaN();
public:
explicit YGFloatOptional(float value);
YGFloatOptional() = default;
explicit constexpr YGFloatOptional(float value) : value_(value) {}
constexpr YGFloatOptional() = default;
// Program will terminate if the value of an undefined is accessed. Please
// make sure to check if the optional is defined before calling this function.
// To check if float optional is defined, use `isUndefined()`.
float getValue() const;
// Sets the value of float optional, and thus isUndefined is assigned false.
void setValue(float val) {
value_ = val;
isUndefined_ = false;
}
bool isUndefined() const {
return isUndefined_;
return std::isnan(value_);
}
YGFloatOptional operator+(const YGFloatOptional& op) const;
bool operator>(const YGFloatOptional& op) const;
bool operator<(const YGFloatOptional& op) const;
bool operator>=(const YGFloatOptional& op) const;
bool operator<=(const YGFloatOptional& op) const;
bool operator==(const YGFloatOptional& op) const;
bool operator!=(const YGFloatOptional& op) const;
YGFloatOptional operator+(YGFloatOptional op) const;
bool operator>(YGFloatOptional op) const;
bool operator<(YGFloatOptional op) const;
bool operator>=(YGFloatOptional op) const;
bool operator<=(YGFloatOptional op) const;
bool operator==(YGFloatOptional op) const;
bool operator!=(YGFloatOptional op) const;
bool operator==(float val) const;
bool operator!=(float val) const;